sing-box/transport/fakeip/server.go

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package fakeip
import (
"context"
"net/netip"
"os"
"github.com/sagernet/sing-box/adapter"
"github.com/sagernet/sing-dns"
E "github.com/sagernet/sing/common/exceptions"
"github.com/sagernet/sing/common/logger"
"github.com/sagernet/sing/service"
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mDNS "github.com/miekg/dns"
)
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var (
_ dns.Transport = (*Transport)(nil)
_ adapter.FakeIPTransport = (*Transport)(nil)
)
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func init() {
dns.RegisterTransport([]string{"fakeip"}, func(options dns.TransportOptions) (dns.Transport, error) {
return NewTransport(options)
})
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}
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type Transport struct {
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name string
router adapter.Router
store adapter.FakeIPStore
logger logger.ContextLogger
}
func NewTransport(options dns.TransportOptions) (*Transport, error) {
router := service.FromContext[adapter.Router](options.Context)
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if router == nil {
return nil, E.New("missing router in context")
}
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return &Transport{
name: options.Name,
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router: router,
logger: options.Logger,
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}, nil
}
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func (s *Transport) Name() string {
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return s.name
}
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func (s *Transport) Start() error {
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s.store = s.router.FakeIPStore()
if s.store == nil {
return E.New("fakeip not enabled")
}
return nil
}
func (s *Transport) Reset() {
}
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func (s *Transport) Close() error {
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return nil
}
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func (s *Transport) Raw() bool {
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return false
}
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func (s *Transport) Exchange(ctx context.Context, message *mDNS.Msg) (*mDNS.Msg, error) {
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return nil, os.ErrInvalid
}
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func (s *Transport) Lookup(ctx context.Context, domain string, strategy dns.DomainStrategy) ([]netip.Addr, error) {
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var addresses []netip.Addr
if strategy != dns.DomainStrategyUseIPv6 {
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inet4Address, err := s.store.Create(domain, false)
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if err != nil {
return nil, err
}
addresses = append(addresses, inet4Address)
}
if strategy != dns.DomainStrategyUseIPv4 {
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inet6Address, err := s.store.Create(domain, true)
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if err != nil {
return nil, err
}
addresses = append(addresses, inet6Address)
}
return addresses, nil
}
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func (s *Transport) Store() adapter.FakeIPStore {
return s.store
}